Valve mechanism



Jan. 4, 1927. 1,613,012

L. M; BAKER VALVE MECHANISM Filed June 20, 1924 Patented Jan. 4, 1927.

UNETED STA LESLIE M. BAKER, or nvANsfroN, Immers.

VALVE MEGHANISM.

Application filed June 20, 1924. Serial No. 721,243.

This invention relates to valve mechanisms for internal combustion engines but more particularly to the poppet valve type and has tor its primary object to eliminate the noise incidental to the operation ot such mechanisms.

Further objects of my invention are to reduce the wear on the parts, to provide smooth operati-on ot the valves, and in general to provide an improved valve mechanism.

The many of my invention by reference to when considered other objects and advantages will be better understood the following specification in connection with the accompanying drawing illustrating a se-` Fig. 2 is a detail top plan view ot the silencer.

In order to insure proper closing of the valve in internal combustion engines, it is generally considered necessary to provide a certain amount of clearance between the valve stem and the actuating part. The sudden impact 'ot' the part with the valve stem tends to produce a click when these contacting members are of metal. This noise increases as the parts wear and becomes very objectionable, particularly in engines of the overhead valve type. My improved silencer efficiently performs its function and the wear is hardly appreciable after a long period of service.

Referring to the drawing and particularly to Figs. 1 and 2, I have shown a valve mechanism ot the overhead type mounted on the cylinder head 10. This includes the usual rocker arm 11 pivoted at 12, thepush rod 13 connected thereto, the valve stem 14, valve 15 and spring 16.

A collar 17 is secured upon the upper portion of the valve stem by the usual pin 18 to confine the spring 16. A cup-shaped member 19 is mounted upon the upper end of the stem and forms the silencer tor the valve mechanism. This member is provided with a cylindrical recess or socket 2O in its base to receive and fit the end Vot' the stem. The end face ot the stem abuts the base wall of the recess in which the stem is a running lit. It this member is slightly lifted by the withdrawal ci the rocker arm,

a partial vacuum will be formed in the bottom of the recess and thus will serve to draw the member into proper position. Tn case there should be a slight leakage otl air into th-e recess, this will not be detrimental and in tact, it is somewhat advantageous as this air acts as a cushion to dissipate the shock of impact. This will not interfere with the proper opening or the valve.

ln order to eliminate any tendency towards noise, I prefer to make the silencer oi a non metallic material, and such material may advantageously comprise spinnable textile fibers or fabric with a phenol condensa `tion binder. This specific material has been used quite extensively in the construction oi timing gears ltor internal combustion engines. The cup-shaped top face ot this member forms an oil receiving and retaining receptacle and the protuberance 2l on the end of the rocker arm 11 operates upon this tace to open the valve.

Tt will be obvious that the Vprotuberance 2O not only delivers an impact upon llhe silencer but is drawn across the surface ol the same, due to its arcuate movement. Vhen the parts are not lubricated this movement causes wear, and noise as a result ot such wear. In my improved silencer' the oil constantly held by the cup-shaped tace thoroughly lubricates this fare and practically eliminatesthis wear. The elimination of friction between the protuberance and the valve stem also eradicates any tendency o'f the stem to be jammed by this arcuate movement of the protuberance and insures smooth action ol? the valve. The silencer member may be manually rotated upon the valve stem at any time to be sure that it is operating properly. The removal and replacement of the silencers is a simple matter as will be obvious.

Since the wearing surface of the silencer is flat and in a plane at right angles to the axis of the valve stem` any lateral movement or displacement of the stem relative to the rocker arm, due to wear or ordinary looseness of fit, will not change the amount of the clearance between said parts.

I am aware that the construction ot rmy improved silencer may be considerab y varied without departing from the spirit ot my invention, and I- reserve the right to make all'such changes therein tairlv fall within the scope of the following claims.

I claim as my invention:

fonibination of a valve stein having a cylindrical end, a rocker arm having a rounded protuberance for actuating, end disposed over. said stem, a body containing textile ber rigidly incorporated therein, removably interposed between said protuberenee and saidsteni and having a cylindriral recess in its underside for fitting and receiving the end or" the stein, and serving to center and retain said body in position on said stein7 the Opposite side of said body being provided with a wearing' surface in a plane :it right angles to the axis ei! the stein and a riin surrounding' seid wearing surface and serving to retain oil applied to said wearing surface.

2. A replaceable silencer unit adapted to p @be interposed between the cylindrical upper l. in a vdevice of the Class described, the@ end of a valve stein and a rocker erin having an actuating protuberance thereon, which comprises a body having` its underside formed with a cylindrical recess in which the end of the stein fits and is received, the upper side of said body being' fiat and located in a plane et right angles to the axis of the recess, the distance between the upper end of the recess and the said plane being rela-V tively small compared with the total Athiclness of the unit whereby tendency of the unit to tilt on the end of said stein due to arcuate movement of the rocker will be substantially prevented, said body being' provided with a rim surrounding' saidweering surface to retain lubricant. i

LEsLIE M. BAKER. 

